• Audrey T Moynihan, Mark P Hehir, Siobhan V Glavey, Terry J Smith, and John J Morrison.
• Department of Obstetrics and Gynaecology, Clinical Science Institute, University College Hospital Galway, National University of Ireland, Galway, Ireland.
• Am. J. Obstet. Gynecol. 2006 Aug 1; 195 (2): 504-9.

ObjectiveThe purpose of this study was to investigate the effects of leptin on human uterine contractility in vitro.Study DesignBiopsies of human myometrium were obtained at elective cesarean section (n = 18). Dissected myometrial strips suspended under isometric conditions, undergoing spontaneous and oxytocin-induced contractions, were exposed to cumulative additions of leptin in the concentration range of 1 nmol/L to 1 micromol/L. Control strips were run simultaneously. Integrals of contractile activity were measured using the PowerLab hardware unit and Chart v3.6 software.ResultsLeptin exerted a potent and cumulative inhibitory effect on spontaneous and oxytocin-induced contractions compared to control strips. The mean maximal inhibition values were as follows: 46.794 +/- 5.133% (n = 6; P < .001) for spontaneous contractions and 42.323 +/- 3.692% (n = 6; P < .001) for oxytocin-induced contractions. There was an apparent reduction in both frequency and amplitude of contractions.ConclusionThis physiologic inhibitory effect of leptin on uterine contractility may play a role in the dysfunctional labor process associated with maternal obesity, and the resultant high cesarean section rates.

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